/**************************************************************************************************
* @fn npSpiInit
*
* @brief This function is called to set up the SPI interface.
*
* input parameters
*
* None.
*
* output parameters
*
* None.
*
* @return None.
**************************************************************************************************
*/
void npSpiInit(void)
{
uint32 ulDummy;
if (ZNP_CFG1_UART == znpCfg1)
{
return;
}
/* Configure SRDY and deassert SRDY */
GPIOPinTypeGPIOOutput(HAL_SPI_SRDY_BASE, HAL_SPI_SRDY_PIN);
GPIOPinWrite(HAL_SPI_SRDY_BASE, HAL_SPI_SRDY_PIN, HAL_SPI_SRDY_PIN);
/* Configure MRDY and deassert MRDY */
GPIOPinTypeGPIOInput(HAL_SPI_MRDY_BASE, HAL_SPI_MRDY_PIN);
GPIOPinWrite(HAL_SPI_MRDY_BASE, HAL_SPI_MRDY_PIN, HAL_SPI_MRDY_PIN);
/* Enable SSI peripheral module */
SysCtrlPeripheralEnable(BSP_SPI_SSI_ENABLE_BM);
/* Delay is essential for this customer */
SysCtrlDelay(32);
/* Configure pin type */
GPIOPinTypeSSI(BSP_SPI_BUS_BASE, (BSP_SPI_MOSI | BSP_SPI_MISO | BSP_SPI_SCK | HAL_SPI_SS_PIN));
/* Map SSI signals to the correct GPIO pins and configure them as HW ctrl'd */
IOCPinConfigPeriphOutput(BSP_SPI_BUS_BASE, BSP_SPI_MISO, IOC_MUX_OUT_SEL_SSI0_TXD);
IOCPinConfigPeriphInput(BSP_SPI_BUS_BASE, BSP_SPI_SCK, IOC_CLK_SSIIN_SSI0);
IOCPinConfigPeriphInput(BSP_SPI_BUS_BASE, BSP_SPI_MOSI, IOC_SSIRXD_SSI0);
IOCPinConfigPeriphInput(BSP_SPI_BUS_BASE, HAL_SPI_SS_PIN, IOC_SSIFSSIN_SSI0);
/* Disable SSI function */
SSIDisable(BSP_SPI_SSI_BASE);
/* Set system clock as SSI clock source */
SSIClockSourceSet(BSP_SPI_SSI_BASE, SSI_CLOCK_SYSTEM);
/* Configure SSI module to Motorola/Freescale SPI mode 3 Slave:
* Polarity = 1, observed in scope from MSP430 master
* Phase = 1, observed in scope from MSP430 master
* Word size = 8 bits
* Clock = 2MHz, observed MSP430 master clock is 2049180Hz
*/
SSIConfigSetExpClk(BSP_SPI_SSI_BASE, SysCtrlClockGet(), SSI_FRF_MOTO_MODE_3,
SSI_MODE_SLAVE, 2000000UL, 8);
/* Register SPI uDMA complete interrupt */
SSIIntRegister(BSP_SPI_SSI_BASE, &npSpiUdmaCompleteIsr);
/* Enable uDMA complete interrupt for SPI RX and TX */
SSIDMAEnable(BSP_SPI_SSI_BASE, SSI_DMA_RX | SSI_DMA_TX);
/* Configure SPI priority */
IntPrioritySet(INT_SSI0, HAL_INT_PRIOR_SSI0);
IntPrioritySet(INT_GPIOB, HAL_INT_PRIOR_SSI_MRDY);
/* Enable the SSI function */
SSIEnable(BSP_SPI_SSI_BASE);
GPIOIntTypeSet(HAL_SPI_MRDY_BASE, HAL_SPI_MRDY_PIN, GPIO_BOTH_EDGES);
GPIOPortIntRegister(HAL_SPI_MRDY_BASE, *npSpiMrdyIsr);
GPIOPinIntEnable(HAL_SPI_MRDY_BASE, HAL_SPI_MRDY_PIN);
/* Initialize uDMA for SPI */
npSpiUdmaInit();
}
void SPI_spi0_slave_init(void)
{
unsigned long tmpbuf;
// The SSI0 peripheral must be enabled for use.
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
//
// For this example SSI0 is used with PortA[5:2]. GPIO port A needs to be
// enabled so these pins can be used.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//
// Configure the pin muxing for SSI0 functions on port A2, A3, A4, and A5.
// This step is not necessary if your part does not support pin muxing.
//
GPIOPinConfigure(GPIO_PA2_SSI0CLK);
GPIOPinConfigure(GPIO_PA3_SSI0FSS);
GPIOPinConfigure(GPIO_PA4_SSI0RX);
GPIOPinConfigure(GPIO_PA5_SSI0TX);
//
// Configure the GPIO settings for the SSI pins.
// The pins are assigned as follows:
// PA5 - SSI0Tx
// PA4 - SSI0Rx
// PA3 - SSI0Fss
// PA2 - SSI0CLK
//
GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
GPIO_PIN_2);
//
// Configure and enable the SSI port for SPI master mode. Use SSI0,
// system clock supply, idle clock level low and active low clock in
// freescale SPI mode, master mode, 1MHz SSI frequency, and 8-bit data.
//
SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
SSI_MODE_SLAVE_OD, 1000000, 8);
//
// Enable the SSI0 module.
//
SSIEnable(SSI0_BASE);
//
// Emputy the SSI rx FIFO
//
while (SSIDataGetNonBlocking(SSI0_BASE, &tmpbuf)) {}
//
// Register SPI Int Handler
//
SSIIntRegister(SSI0_BASE, SPI_spi0_int_handler);
//
// Enable the SSI interrupt.
//
IntEnable(INT_SSI0);
SSIIntEnable(SSI0_BASE, SSI_RXFF|SSI_RXTO|SSI_RXOR);
}